Combination electrical and mechanical security system

ABSTRACT

A security system includes combination electrical and mechanical unlocking and locking mechanisms. The electrical and mechanical mechanisms are independent of each other. The electrical mechanism is the primary system for opening, closing and locking a plurality of doors such as cell doors and the mechanical system is backup in case of electrical power failure.

[451 Feb. 18,1975

.United States Patent [191 Butt 3,426,478 2/1969 Sturgcs ct al. 3,564 772 2/1971 O7ier et al COMBINATION ELECTRICAL AND MECHANICAL SECURITY SYSTEM [75] Inventor: Gerald L. Butt, Independence, Ky.

Stewart-Decatur Security Systems Incorporated, Covington, Ky.

Aug. 1, 1973 Primary ExaminerKenneth Downey Attorney, Agent, or Firm-J0hn G. Schenk [73] Assignee:

[22] Filed:

ABSTRACT Appl. No; 384,608

A security system includes combination electrical and mechanical unlocking and locking mechanisms. The electrical and mechanical mechanisms are independent of each other. The electrical mechanism is the primary system for opening, closing and locking a plurality of doors such as cell doors and the mechanical system is backup in case of electrical power failure.

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[56] References Cited UNITED STATES PATENTS 3,082,847 3/1963 Young 49/16 10 Claims, 8 Drawing Figures PATENTEU FEB I 81975 3.866.354 SHEET 10F 4 PMENTEU 3. 866,354

sum 3 or 4 COMBINATION ELECTRICAL AND MECHANICAL SECURITY SYSTEM BACKGROUND OF THE INVENTION This invention relates generally to security systems and more particularly to a combination electrical and mechanical security system for opening and closing sliding cell doors.

Numerous mechanisms are known for securing a single cell door, as well as a plurality of cell doors in gang fashion, such as in a cell block. In many prior art systems, individual rods and linkages were connected to each door. Each of the rods and linkages would terminate in a control panel such that each rod would have to be actuated in order to open or close a cell door. In instances where there were a multiplicity of doors, such as 20 or the like, the control panels would be extremely large due to the numerous rod terminations, such as 20 in this instance. Such an arrangement is not only costly and unwieldy, but is timeconsuming to operate.

Accordingly, it is an object of this invention to provide a security system for sliding cell doors in which a single bell bar is used to selectively unlock individual doors in the mechanical mode of operation.

A further object of this invention is to provide security system for sliding cell doors of simple and economical construction and which eliminate numerous linkages and slot members previously used in such devices.

Yet another object of this invention is to provide security system for sliding cell doors having an electrical mechanism for normal operation and an independent mechanical system as backup in case of power failure.

SUMMARY OF THE INVENTION This invention provides improved security system for unlocking, opening and locking and closing of sliding cell doors. The security system has an electrical mode operation for normal operation and a backup mechanical mode in case of electrical power failure. The electrical system includes an electric motor and gearing to unlock and drive open the cell doors and close the cell doors. The mechanical backup system includes linkages to unlock all of the cell doors or selective individual doors after which the doors must be manually moved to the open position. The doors are locked in the full open position. Unlocking of the doors in either the opened or closed positions occurs through a lost motion mechanism.

Other objects, details, uses and advantages of this invention will become apparent as the following description of an exemplary embodiment thereof presented in the accompanying drawings proceeds.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings show a present exemplary embodiment of this invention in which:

FIG. 1 is an elevation view of the security system being used to secure a single cell door, the casing covering being broken away to show the internal mechanism;

FIG. 2 is an elevational view of the control panel with the door open which is used in conjunction with the system of FIG. 1;

FIG. 3 is a sectional view of the mechanical linkage in the control panel as taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 44 of FIG. 3',

FIG. 5 is a plan view taken along line 5-5 of FIG. 1;

FIG. 6 is a rear elevational view taken along line 66 of FIG. 5;

FIG. 7 is an enlarged sectional view taken along line 77 of FIG. 6; and

FIG. 8 is a sectional view taken along line 8-8 of FIG. 2.

DESCRIPTION OF ILLUSTRATED EMBODIMENT Reference is now made to FIGS. 1 and 2 of the drawings which illustrate one exemplary embodiment of the improved electrical and mechanical security system used in the operation and control of sliding doors, such as cell doors in a prison, or the like. For illustrative purposes only, the mechanism of this invention is shown in conjunction with a single cell door 10. It should be apparent that this mechanism may be used with a single door unit or a plurality or gang of cell doors. In FIG. I, the casing cover 11 is broken away to show the mechanism for controlling and locking the cell door 10. The

- door 10 of FIG. 1 is shown in the closed and locked position in which one end of the door is abutting the door strike 12. The other edge of the door 10 comprises a drop bar housing 13 which in the closed position is properly aligned so a drop bar 14 is properly aligned with a slot 15 in the door guide 16 so that the drop bar will fall through the slot and lock the cell door in the closed position.

The cell door 10 is carried for sliding movement along a transom 17 by a pair of wheels 20 and 21 which roll along a track 22. The track 22 is securedly fixed to the transom I7 by any suitable means such as welding or the like. A hanger bar 23 is supported on one side of the wheels 20 and 21 by bolts 24 and 25, respectively. Suitable washers or the like provide a separation between the wheels and the hanger bar to insure that the wheels will be free rolling.

A door hanger angle member 26 is connected to the hanger bar 23 by a fixed pivot bolt 27 and a pair of eccentric bushing and bolts 28 and 29. The cell door 10 is fixedly secured to the door hanger angle member 26 by any suitable means. The eccentrics and bolts 28 and 29 permit adjustment of the hanger angle member 26 about the bolt 27 relative to the hanger bar 23 so as to permit a level travel of the cell door 10 between the open and closed position. A pair of retainer straps 32 and 33 are fixed to the hanger bar by suitable means such as bolts or the like. The lower edge of the retainer straps 32 and 33 project inwardly so as to cooperate with the underside of the track 22 to prevent the rollers or wheels 20 and 21 from being lifted off the track 22.

Mounted at each end of the track 22 is a stop member 34 and 35, respectively. Each stop member is provided with a cushion surface 36 of rubber or the like. Each stop member is positioned so that the cushion sur face 36 will engage the respective ends of the hanger bar 23 when the cell door 10 is in either the full open or full closed position. The stop members 34 and 35 are adjustable to permit limited axial adjustment of the cushion surface 36 to insure that the cell door 10 is properly positioned in the full open or full closed position.

The controls for the security system are housed in a control panel 37 located at one end of the line of cells or in the embodiment herein described at the end of cell door 10 as shown in FIGS. 1 and 2. Referring particularly to FIG. 2, the control panel 37 is shown with the door 38 in the open position to permit viewing of the respective controls. An operational mode lever 40 determines whether the system shall be operated in the electrical mode or mechanical mode. As shown, the lever 40 is positioned in the electrical mode such that a pin or plunger from the handle 41 of lever 40 engages an electrical mode detent 42. The mechanical mode detent is shown at 43. A mechanical unlocking lever 44 is shown in the normal position for electrical mode operation.

An electrical control box designated generally as 45 houses the respective electrical controls. A key switch 46 is used to turn the electrical power to the system ON and OFF. Switch 47 connects, through appropriate relays and circuitry (not shown), all of the cell doors with the respective electrical opening mechanisms. If it is desired to selectively open only certain doors, individual cell switches may be engaged. Thus, in the example shown, switches 50 and 51, respectively, control cell door and a second cell door, not shown. The switches 50 and 51 have three positions, i.e., OPEN, GROUP and CLOSE. With the individual switches 50 and 51 in the GROUP position, the ALL switch 47 may be used to open or close all the doors in the cell block simultaneously. If only a certain door is wanted to be opened, the respective switch is moved to the OPEN position. Likewise, selective doors may be isolated from group operation by moving the respective switch to the CLOSE position. Each of the control switches 50 and 51 is provided with a pair of indicator lights 52 and 53. The lights 52 and 53 provide an indication of-the fully closed or fully opened position of the respective cell doors. Thus, as an example, light 52 may have a green lens to indicate that the cell door is in a fully closed and, thereby, locked position. Lights 53 may have a red lens which, when lit, would indicate that the cell doors are in the fully opened and locked position.

In the electrical mode of operation wherein the levers 40 and 44 are in the position shown in FIG. 2, an electrical motor 55, as best seen in FIGS. 1 and 6, is used to drive a carriage assembly designated generally as 54. The gear head 56 of the motor 55 drives spur gear 57 which in turn drives a rack 60 of the carriage assembly 54. When the motor 55 is not energized, i.e., when the cell door is either fully opened or fully closed, the gearing is such that the rack may not be moved in the opposite direction thereby providing a locking condition to the cell door in either of the extreme positions. Such gear motors are commercially available from General Electric Co., Paterson, New Jersey, and need not be described herein.

The carriage assembly 54 is provided at each end thereof with roller receiving channels 61 and 62, as seen in FIGS. 1 and 6. The channels 61 and 62 accept a drop bar roller 63 which is rotatably mounted to the drop bar 14. The channel 61 is provided with a shoulder 64 such that when the roller 63 is in the channel 61 the roller engages the shoulder 64. The drop bar 14 is thereby prevented from being raised. The channels 61 and 62 are formed respectively with cam surfaces 65 and 66. A roller surface 67 is formed between the cam surfaces 65 and 66.

In order to unlock the cell door 10, the drop bar 14 must be raised out of the slot in the door guide 16. Further, before the cell door can be moved, the drop bar 14 must be moved to the unlocked position. This is accomplished through a pair of lost motion slots 70 and 71 formed in the carriage assembly 54. When the motor 55 is energized, the rack 60 will be driven to the left as seen in FIG. 6. Movement of the assembly 54 to the left will cause the roller 63 to be driven up the cam surface 65 and onto the roller surface 67. At the point the roller 63 reaches the roller surface 67, the drop bar 14 will have cleared the slot 15 in the door guide 16 wherein the drop bar is in the unlocked position. During this same lost motion movement of the carriage as sembly 54, a cam 72 will engage a pin 73 of the latch 74 urging said pin upward into the channel 75. The latch 74 is pivotally secured at 76 to the hanger bar 23. The end 77 of latch 74 engages a slot in the track 22 when the cell door 10 is in the fully closed position to act as a further locking element.

Angle supports 28 and 29 are mounted to the hanger bar 23 and carry bushing members designated generally as 58 and 59. As best seen in FIG. 7, the bushing members are comprised of a pair of bushing elements 78 and 79 separated by a bearing 80, all being mounted on shaft 81. The bushing members 58 and 59, respectively, cooperate with lost motion slots and 71. Thus, it may be seen that the rack 60 is connected to the cell door 10 through the bushing members 58 and 59, hanger bar 23 and door hanger angle 26. After the carriage assembly 54 has traveled through the lost motion distance, the cell door will be in the unlocked condition. In other words, the roller 63 will be on the roller surface 67 and the latch pin 73 will be in the channel and the bushing members 58 and 59 will be at the other end of the respective lost motion slots 70 and 71.

. Continued operation of the motor 55 will urge the rack 60 to continue movement wherein the cell door will be propelled open. The carriage assembly 54 will be driven along the rack 60 until the roller 63 drops into the channel 62, wherein drop bar 14 again enters the slot 15 so as to lock the cell door 10 in the fully opened position. Referring again to FIG. 1, it is seen that a pair of limit switches 82 and 83 are mounted so as to be ac tivated by a clip 84 carried by the rack 60. The limit switches 82 and 83 are double pole, double throw switches.

In other words, one pole will open to shut the motor off and one pole will close to activate the circuitry, not shown, to activate the respective indicator lights 52 or 53. Thus, when the cell door 10 is moved from the fully closed position of FIG. 1 to the right the clip 84 will engage the roller member of limit switch 83 when the cell door 10 has reached the fully opened position at which point the motor 55 is turned off and the respective indicator light 53 is activated to show that the cell door is in the fully opened position. The cell door 10 is closed in the same manner by once again engaging the motor 55 which in turn drives the rack 60 in the opposite direction wherein the carriage assembly 54 travels through the lost motion distance such that cam 66 (FIG. 6) urges the roller 63 upward onto the roller surface 67 thereby unlocking the drop bar 14. When the clip 84 engages limit switch 82 in the fully closed position the motor 55 is again turned off and the fully closed indicator light 52 is activated.

In the event of electrical power failure, the security system may be operated through a mechanical linkage mechanism to permit the opening or closing of the cell doors. Likewise, if it is desired to work on the mechanisms in the transom area the security system may be switched to the mechanical mode of operation so as to stop the electrical power being supplied to the system. Referring to FIG. 2, the system is switched from the electrical mode to the mechanical or selective mode by disengaging the pin protruding from the handle 41 and then rotating the lever 40 in a counterclockwise direction until the handle pin engages the detent 43. The lever 40 is operatively connected to a spur gear 85 (FIG. 4) by a shaft 86. The spur gear 85 drives a rack 87 which forms one end of an actuator bar 88. It is seen that rotation of the lever 40 will cause the actuator bar 88 to be raised or lowered depending on the movement of the handle 40 in the clockwise or counterclockwise direction. A pair of stop members 89 and 90 are fixedly secured to the rear wall of the control panel 37. A protrusion or lug 91 is secured to the actuator bar 88 and limits the linear movement of the actuator bar. Each of the stop members 89 and 90 are adjustable to permit precise travel adjustment of the bar 88. Due to the stop members 89 and 90, the lever 40 may only be rotated in the counterclockwise direction when starting from the electrical detent 42 and clockwise from the mechanical or selective detent 43.

A limit switch 92 is secured to the rear wall of the control panel 37 adjacent the actuator bar 88. A cam member 93 is secured by bolts or the like to the actuator bar 88 for cooperative engagement with the limit switch 92. In the electrical mode position as shown in FIG. 4, the cam member 93 contacts the limit switch 92 to permit electrical power to be supplied to the electrical mechanism. As the handle 40 is rotated in the mechanical or selective mode position the actuator bar 88 is moved upwardly and the cam member 93 moves out of contact with the limit switch 92 wherein the limit switch 92 opens the electrical circuitry so as to stop all electrical power to the system.

A bracket 94 having a pair of bearings or the like 95 is mounted to the control panel 37 and acts as a guide for the actuator bar 88. The upper end of the actuator bar 88 is pivotally connected to a bell crank 96 through link 97. The link 97 is connected to the actuator bar 88 and bell crank 96 by pivot pins or the like 98 and 99. The bell crank 96 is mounted for pivotal movement about pivot 100 by a bracket 101. The bell crank 96 is pivotally connected to a master bar 102 through a link 103. Pivot pins 104 and 105, respectively, connect the link 103 with the bell crank 96 and master bar 102. A plurality of prackets 106 support the master bar 102 for sliding movement along the transom 17 as best seen in FIG. I. Only one of the plurality of brackets 106 is shown. Each bracket 106 includes a pair of bearings 107 on either side of the master bar 102 to permit rela tively frictionless travel of bar 102.

A wedge-shaped cam member 108 is securedly mounted to the master bar 102 for travel therewith, as seen in FIG. I. The camming surface 109 of the cam member 108 is engageable with a roller member 110 which is rotatably mounted to the upper arm portion 111 of a motor bracket mount designated generally as 112. The mount 112 is pivotally secured to the transom by a pivot shaft 113. The gear head 56 is secured to the motor bracket mount 112 for movement therewith. Thus, as the roller 110 is cammed upward by the cam surface 109 the motor mount will pivot about shaft 113 and the gear head 56 will be raised wherein the motor 55 is disengaged from the rack 60. In the electrical mode of operation, the motor 55 is prevented from having its gear head 56 becoming disengaged from the rack 60 by a pendulum member 114 which engages a hold down plate 115 which is a part of the motor bracket mount 112. Thus, when the lever 40 is moved in the counterclockwise direction the actuator bar 88 is moved upward. The movement of the actuator bar in the upward direction imparts a force through the link 97, bell crank 96 and link 103 to urge the master bar 102 to the right as seen in FIG. 1. Movement of the master bar 102 to the right causes the end of the wedge cam member 108 to engage the pendulum 114. The pendulum 114 is rotated in a counterclockwise direction and becomes disengaged with the hold down plate 115. At this point, continued movement of the actuator bar 102 will cause the cam surface 109 to cam the roller 110 in the upward direction thereby disengaging the electrical motor from the rack 60.

With the security system in the mechanical or selective mode of operation wherein the lever 40 is in contact with the detent 43, a door control lever 116, as seen in FIGS. 2, 3 and 4, is used to control the unlocking of the respective cell doors. In the present illustrative embodiment, it is seen that the lever 116 is in the ALL open position wherein a pin or the like 117 (FIG. 3) projecting from the handle 118 is in engagement with an ALL detent 119. Detents 120 and 121, respectively, control the locking and unlocking of individual cell doors 10 and a second door, not shown. Lever 116 is pivotally connected to a spur gear 122 by shaft 123. The spur gear 122, as seen in FIGS. 3 and 4, drives a rack 124 formed at one end of a bell bar actuator bar 125. Adjustable stop members 150 and 151 coact with lug 152 on bar 125 to limit maximum travel of bar 125. The-actuator bar 125 rotatably controls the positioning of bell bar 126 through rack 127 and spur gear 128. The rack 127 is formed at the upper end of actuator ba r 125 and the spur gear 128 is mounted on bell bar 126. It is thus seen that rotary movement of the lever 116 will impart a rotary movement to the bell bar 126.

Referring now to FIGS. 2, 5 and 8, it is seen that a plurality of tin hubs designated generally as 129 is mounted about bell bar 126 and is rotatably carried therewith. A pair of the fin hubs 129 is used in conjunction with each cell door in the respective cell block. In FIG. 5, it can be seen that hubs 129a and 12% control cell door 10 and hub 1290 forms a part of the pair to control the second cell door, not shown. Each hub 129 is formed with two projecting fin elements. Thus. in FIG. 8, it is seen that hub 1290 includes fin elements 130 and 131. Fin element 132 relates to fin hub 1296.

Each hub 129 includes a fin element 130 projecting outwardly at the same angular position. The second fin element, such as 131 or 132 in this embodiment, projects outwardly at a different angular relationship relative to the axis of the bell bar 126. The respective fin elements 130, 131 and 132 project outwardly a sufficient distance to engage a horizontal arm of a corresponding slide bar.

In FIGS. 1, 5 and 8, it is seen that slide bars 134 and 135 are associated with the mechanism for cell door 10. The front slide bar 134 is mounted for sliding movement relative to the transom 17 by a pair of brackets 136 and 137. The slide bar 134 is mounted for movement along the transom 17 by any suitable means such as bearings supported by the brackets 136 and 137, respectively, cooperating with slots formed in the slide bar 134. The slide bar 134 is provided with a horizontal arm member 133 and a vertical arm member 138 which projects downwardly from the slide bar 134.

The rear slide bar 135 is mounted by brackets 139 and 140 for sliding movement relative to the transom 17 in a manner similar to the front slide bar 134. The slide bar 135 includes a horizontal arm member 141 projecting therefrom. It may be noted that all of the horizontal arm projections lie in the same plane. An unlocking lever 143 is pivotally attached to the transom by a pivot shaft 144 and is rotatable thereabout. The

end of the lever 143 is connected by a pivot pin or the like 145 to a tail portion 142 of the rear slide bar 135. It can be seen in FIG. 8 that as the bell bar 126 is rotated in response to movement of the lever 116, the respective fin elements 130, 131 and 132 will be brought into the plane of the horizontal arm portions of the slide bars for the purpose to be explained hereinbelow.

Referring once again to FIG. 2, it is seen that the mechanical unlocking lever 44 is mounted for rotational movement about a pivot shaft 18. The end of the lever 44 is a U-shaped yoke 19 for engaging the end of bell bar 126. Bell bar 126 is provided with a complementally formed fitting 39 which cooperates with the yoke 19. Thus, the bell bar 126 and fitting 39 may be rotationally moved relative to the yoke 19. Similarly, when the lever 44 is moved from the position shown to the point marked A, the bell bar 126 will be moved in a linear direction to the right, as shown.

In the mechanical mode of operation, with the lever 116 engaging the ALL detent 119 as shown in FIG. 2, the fin elements 130 will all be positioned in the plane of the horizontal arms of the slide bars. As the lever 44 is pivoted about shaft 18 in the clockwise direction the bell bar 126 will be moved to the right. Linear movement of the bell bar 126 causes the respective fin elements 130 to engage the horizontal arm 133 thereby urging the front slide bar 134 to the right. The vertical arm 138 of the slide bar 134 will engage a pin 48 secured to the rack 60 causing movement of the rack 60 to the right. The movement of the rack 60 will cause the carriage assembly 54 to proceed through the lost motion action hereinabove described relative to the electrical mode of operation. Thus, the cell door 10 will become unlocked due to the pivoting of the lever 44. It should be noted that in the operation of the mechanical mode, the handle 44 is moved to the position designated A" and then immediately returned to the normal or operational position. With the respective cell doors unlocked, the prisoners can manually open the respective cell doors to the fully opened position wherein they will again be locked as hereinabove described. When the cell door 10 (FIG. 1) is moved to the full open position, a pin 49 secured to the rack 60 will engage the lever 143 urging it in a counterclockwise direction thereby urging the slide bar 135 to the left. When it is desired to close the respective cell doors, the unlocking lever 44 is again rotated clockwise to the A position causing the slide bar to be driven in a linear direction to the right. This movement of the bell bar 126 will cause the tin element 130 of the hub 12% (FIG. 5) to engage the horizontal arm 141 thereby urging the slide bar 135 to the right. Movement of the slide bar 135 to the right will cause the unlocking lever 143 to be rotated clockwise. Clockwise rotation of the lever 143 will cause the pin 49 and, thus, rack 60 to be urged to the left. Thus, the carriage assembly 54 will travel through the lost motiondistance to unlock the respective cell doors wherein the prisoners can manually urge the cell doors to the fully closed position.

In the mechanical mode of operation, individual doors may be selectively opened one at a time. Thus, the lever 116 is rotated about shaft 123 to the desired detent, it being remembered that each detent corresponds to a respective cell door. This movement of the lever 116 will cause the bell bar 126 to be rotated about its axis. Rotation of the bell bar 126 will cause the respective ALL fin elements 130 to move out of the plane of the horizontal arms. The pair of fin elements controlling the cell door which it is desired to unlock as determined by the respective detent (120, 121, for example) will be brought into the plane of the horizontal arms of the respective slide bars. Thus, when the unlocking lever 44 is actuated only the fin elements aligned with the respective horizontal arms will cause an unlocking of the cell door. If a second cell door is desired to be opened at this point, the process is again repeated by rotating the lever 116 to the proper detent position and again rotating the lever arm 44.

A casing lock bar 68 is partially shown in FIG. 2. The lock bar 68 is connected to the casing lock bar lever 69 by a pivot member 79. The casing lock bar lever 69 is shown in the locked position wherein the lock bar 68 is engaged with the cover bracket 146, thereby preventing the opening of the cover 11. counterclockwise movement of the lever 69 about pivot 147 will cause the lock bar 68 to move to the left so as to bring the slot 148 into alignment with the bracket 146 to permit opening of the cover 11.

It may be further noted that the control panel door 38 may be locked in the closed position through the use of any suitable lock 149, as shown in FIG. 3.

It can be seen that the security system hereinabove described permits the selective opening of individual cell doors or an entire cell block when in the electrical mode of operation. In case of power failure or when it is desired to work on the equipment, the security system may be switched to a mechanical or selective mode of operation which cuts all power to the electrical system. In the mechanical mode of operation, individual cell doors may be unlocked one at a time, or the entire bank of cell doors may be unlocked. In the mechanical mode of operation, a single bell bar is used to unlock the respective doors. Accordingly, the objectives hereinbefore set forth have been accomplished.

While a present exemplary embodiment of this invention has been illustrated and described, it will be recognized that this invention may be otherwise variously embodied and practiced within the scope of the following claims.

What is claimed is:

1. A combination electrical and mechanical security system for separate electrical and mechanical mode operation for remotely locking and unlocking selected sliding doors comprising electric motor and gear means associated with each respective door, mechanical actuation means independent of said electric drive means, mode control means operatively connected with said electric motor and said mechanical actuation means for determining the operational mode, a drop bar locking each door in the fully opened and fully closed position, a roller rotatably mounted to the upper end of said drop bar, and a carriage assembly associated with each respective door and operatively connected with said respective drop bar to unlock said drop bar in response to said respective electrical motor and said mechanical actuation means depending on the operational mode, said carriage assembly including a linear rack, said gear means connecting said electrical motor with said rack wherein activation of said electrical motor will drive said rack in a linear direction, a pair of roller receiving channels formed at each end of said rack, said channels being connected by a roller surface wherein when said roller is in one of said receiving channels said drop bar is in the locked position and when said roller is on said roller surface said drop bar is in the unlocked position, a cam surface forming one side of each of said roller receiving channels, a pair of linear lost motion slots formed in said rack, means connecting said rack through said lost motion slots with the door wherein movement of said rack a linear distance corresponding to said lost motion slots will cause the respective cam surface to urge said roller up said cam surface onto said roller surface thereby unlocking said drop bar, a bracket mount connected with said gear means, said bracket mount being pivotally secured relative to said rack, a pendulum for holding said gear means in engagement with said rack during the electrical operational mode, said pendulum engaging said bracket mount to prevent pivoting of said mount relative to said rack, mechanical links connected with said control means, a master bar mounted in parallel relationship to said carriage assembly and supported for sliding movement relative thereto, said master bar being connected with said mechanical links, and a cam member secured to said master bar, said cam member being operatively engagable with said pendulum and said bracket mount wherein movement of said mode control means to the mechanical operational mode portion will cause said cam member to pivot said pendulum away from said bracket mount and said cam member will engage said bracket mount to pivot said mount there by disengaging said gear means from said rack.

2. The system as set forth in claim 1 further comprising first and second limit switches, a clip mounted on said rack, said clip engaging said first limit switch when the door is in the fully closed position and engaging said second limit switch when said door is in the fully opened position wherein energization of said electric motor will cause said gear means to drive said carriage assembly through said rack from one position through the lost motion distance and to the other position wherein said clip will engage said respective limit switch thereby causing said electric motor to stop.

3. The system as set forth in claim 1 further comprising mechanical door selecting means for selecting the doors to be unlocked in the mechanical operational mode. said door selecting means being connected with said mechanical actuation means.

4. The system as set forth in claim 3 further comprising first and second slide bars, said first and second slide bar being mounted for sliding movement relative to said carriage assembly, said first slide bar being engageable with said carriage assembly when the door is in the fully closed position and said second slide bar being engageable with said carriage assembly when the door is in the fully opened position.

5. The system as set forth in claim 4 in which a pair of said first and second slide bars is associated with each door and carriage assembly.

6. The system as set forth in claim 5 in which said mechanical actuation means includes a single bell bar mounted for sliding movement relative to said carriage assembly and first and second slide bars, and a lever for imparting linear movement to said bell bar, means on said bell bar being engageable with said respective slide bars wherein linear movement of said bell bar will be transmitted through said slide bar engaging means to said carriage assembly wherein said carriage assembly will be driven linearly the lost motion distance to unlock said drop bar.

7. The system as set forth in claim 6 in which said slide bar engaging means includes a hub having a pair of angularly projecting fin elements projecting therefrom, each of said slide bars including a horizontal arm projecting therefrom in a common plane, said fin elements being engageable with said horizontal arm when said fin element lies in the same plane as said horizontal arm.

8. The system as set forth in claim 7 in which each hub includes one fin element lying in a common plane, the second fin element of each hub being angularly displaced to correspond to a respective door position wherein movement of said mechanical door selecting means will bring the respective fin element into the common plane with said horizontal arm in response to the selection of the door to be unlocked.

9. The system as set forth in claim 8 in which said door selecting means is operatively connected with said bell bar to permit rotational movement of said bell bar about its axis in response to the movement of said door selecting means to the desired door position thereby bringing the respective fin element into the common plane with said horizontal arm.

10. The system as set forth in claim 9 further comprising first and second pins secured to said rack, said first slide bar including a vertical arm engageable with said first pin to move said carriage assembly linearly through the lost motion distance when the door is in the fully closed position, said second slide bar including a lever engageable with said second pin for movement of said carriage assembly the lost motion distance when the door is in the fully opened position.

* i l l 

1. A combination electrical and mechanical security system for separate electrical and mechanical mode operation for remotely locking and unlocking selected sliding doors comprising electric motor and gear means associated with each respective door, mechanical actuation means independent of said electric drive means, mode control means operatively connected with said electric motor and said mechanical actuation means for determining the operational mode, a drop bar locking each door in the fully opened and fully closed position, a roller rotatably mounted to the upper end of said drop bar, and a carriage assembly associated with each respective door and operatively connected with said respective drop bar to unlock said drop bar in response to said respective electrical motor and said mechanical actuation means depending on the operational mode, said carriage assembly including a linear rack, said gear means connecting said electrical motor with said rack wherein activation of said electrical motor will drive said rack in a linear direction, a pair of roller receiving channels formed at each end of said rack, said channels being connected by a roller surface wherein when said roller is in one of said receiving channels said drop bar is in the locked position and when said roller is on said roller surface said drop bar is in the unlocked position, a cam surface forming one side of each of said roller receiving channels, a pair of linear lost motion slots formed in said rack, means connecting said rack through said lost motion slots with the door wherein movement of said rack a linear distance corresponding to said lost motion slots will cause the respective cam surface to urge said roller up said cam surface onto said roller surface thereby unlocking said drop bar, a bracket mount connected with said gear means, said bracket mount being pivotally secured relative to said rack, a pendulum for holding said gear means in engagement with said rack during the electrical operational mode, said pendulum engaging said bracket mount to prevent pivoting of said mount relative to said rack, mechanical links connected with said control means, a master bar mounted in parallel relationship to said carriage assembly and supported for sliding movement relative thereto, said master bar being connected with said mechanical links, and a cam member secured to said master bar, said cam member being operatively engagable with said pendulum and said bracket mount wherein movement of said mode control means to the mechanical operational mode portion will cause said cam member to pivot said pendulum away from said bracket mount and said cam member will engage said bracket mount to pivot said mount thereby disengaging said gear means from said rack.
 2. The system as set forth in claim 1 further comprising first and second limit switches, a clip mounted on said rack, said clip engaging said first limit switch when the door is in the fully closed position and engaging said second limit switch when said door is in the fully opened position wherein energization of said electric motor will cause said gear means to drive said carriage assembly through said rack from one position through the lost motion distance and to the other position wherein said clip will engage said respective limit switch thereby causing said electric motor to stop.
 3. The system as set forth in claim 1 further comprising mechanical door selecting means for selecting the doors to be unlocked in the mechanical operational mode, said door selecting means being connected with said mechanical actuation means.
 4. The system as set forth in claim 3 further comprising first and second slide bars, said first and second slide bar being mounted for sliding movement relative to said carriage assembly, said first slide bar being engageable with said carriage assembly when the door is in the fully closed position and said seconD slide bar being engageable with said carriage assembly when the door is in the fully opened position.
 5. The system as set forth in claim 4 in which a pair of said first and second slide bars is associated with each door and carriage assembly.
 6. The system as set forth in claim 5 in which said mechanical actuation means includes a single bell bar mounted for sliding movement relative to said carriage assembly and first and second slide bars, and a lever for imparting linear movement to said bell bar, means on said bell bar being engageable with said respective slide bars wherein linear movement of said bell bar will be transmitted through said slide bar engaging means to said carriage assembly wherein said carriage assembly will be driven linearly the lost motion distance to unlock said drop bar.
 7. The system as set forth in claim 6 in which said slide bar engaging means includes a hub having a pair of angularly projecting fin elements projecting therefrom, each of said slide bars including a horizontal arm projecting therefrom in a common plane, said fin elements being engageable with said horizontal arm when said fin element lies in the same plane as said horizontal arm.
 8. The system as set forth in claim 7 in which each hub includes one fin element lying in a common plane, the second fin element of each hub being angularly displaced to correspond to a respective door position wherein movement of said mechanical door selecting means will bring the respective fin element into the common plane with said horizontal arm in response to the selection of the door to be unlocked.
 9. The system as set forth in claim 8 in which said door selecting means is operatively connected with said bell bar to permit rotational movement of said bell bar about its axis in response to the movement of said door selecting means to the desired door position thereby bringing the respective fin element into the common plane with said horizontal arm.
 10. The system as set forth in claim 9 further comprising first and second pins secured to said rack, said first slide bar including a vertical arm engageable with said first pin to move said carriage assembly linearly through the lost motion distance when the door is in the fully closed position, said second slide bar including a lever engageable with said second pin for movement of said carriage assembly the lost motion distance when the door is in the fully opened position. 